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  1. Math

    Tilt-A-Whirl Chaos (II)

    Tilt-A-Whirl in action. Sellner Manufacturing Co. The Tilt-A-Whirl amusement park ride serves as a wonderful example of a chaotic system. The unpredictable motion of the Tilt-A-Whirl’s cars occurs when the ride’s seven platforms travel at a speed of about 6.5 revolutions per minute along the undulating, circular track (see Tilt-A-Whirl Chaos (I), April 22, 2000). […]

    By Ivars Peterson
  2. Health & Medicine

    Asthma pressure may shrink airways

    Mechanical stress from constricting muscles could cause airway-lining cells to reproduce, eventually thickening the lining and narrowing the air passage.

    By Tina Hesman Saey
  3. Chemistry

    Now, nylon comes in killer colors

    Chemists are improving antibacterial fabrics by treating them with compounds that prolong their killing power and add color.